(a)
You can put actuators on the proximity sensors to put the air/ground relay system in the air mode.
(b)
You can lift the airplane on jacks to put the air/ground relay system in the air mode.
(2)
Do not do this task unless a step from a different task tells you to do it. Do not do this task when a step from a different task only tells you to do the "Prepare Safety-Sensitive Systems for Air Mode Simulation" task.
B.
Special Tools and Equipment
(1)
A27092-84 - Actuator/Deactuator Set - Proximity Sensors
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747-400
MAINTENANCE MANUAL
C. References
(1)
AMM 07-11-01/201, Jacking Airplane
(2)
AMM 24-22-00/201, Manual Control
(3)
AMM 29-11-00/201, Main Hydraulic Supply System
D.
Access
(1)
Location Zone
715 Nose Landing Gear
735 Left Wing Landing Gear
745 Right Wing Landing Gear
755 Left Body Landing Gear
765 Right Body Landing Gear
E.
Prepare to put the air/ground relay system in the air mode.
S 862-007
WARNING: YOU MUST CAREFULLY FOLLOW THE STEPS IN THE REFERENCED TASK TO
_______ PREPARE THE SAFETY SENSITIVE SYSTEMS FOR THE AIR MODE. FAILURE TO FOLLOW THE STEPS CORRECTLY CAN CAUSE THE AUTOMATIC OPERATION OF THE AIRPLANE SYSTEMS. THIS CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
(1)
Make sure the task to "Prepare Safety-Sensitive Systems for Air Mode Simulation" has been done. If it was not done, do this task.
S 862-008
(2)
Supply electrical power (AMM 24-22-00/201).
S 862-001
(3)
Make sure you close the circuit breakers that follow:
(a)
P7 Overhead Circuit Breaker Panel
1) 7F22 LANDING GEAR DSP & CONT PRI
2) 7F23 LANDING GEAR DSP & CONT ALTN
3) 7F25 PSEU SECT 1
4) 7F26 PSEU SECT 2
5) 7H08 GND SAFETY RELAY
F.
Put the Air/Ground Relay System in the Air Mode
NOTE: There are two ways to simulate air mode, option 1 is to lift the
____ airplane on jacks, option 2 is to use proximity switch actuators.
S 582-009
(1) Lift the airplane on jacks (AMM 07-11-01/201). (option 1)
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747-400 MAINTENANCE MANUAL
S 482-010
(2)
Do these steps to put the airplane in the air mode with actuators: (option 2)
(a)
Put actuators on these sensors of the wing, body, and nose landing gear: 1) S416 Right Wing Gear Tilt (primary) 2) S614 Right Wing Gear Tilt (alternate) 3) S418 Right Body Gear Tilt (primary) 4) S613 Right Body Gear Tilt (Alternate) 5) S800 Nose Gear Squat switch (primary) 6) S801 Nose Gear Squat (alternate).
(b)
If you cannot put the actuators on the right wing and body gear sensors, you can put the actuators on these sensors:
NOTE: If you put the air/ground system in the air mode to
____ test the thrust reverser system, then you must put the actuators on both the right and left side sensors.
1) S417 Left Wing Gear Tilt (primary) 2) S615 Left Wing Gear Tilt (alternate) 3) S419 Left Body Gear Tilt (primary) 4) S612 Left Body Gear Tilt (alternate) 5) S800 Nose Gear Squat Switch (primary) 6) S801 Nose Gear Squat Switch (alternate)
S 422-053
(3)
If any of the landing gear or tilt sensors are removed, then you will have to connect tilt sensors to the airplane wiring. You will also have to attach actuators to the sensors.
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